The Hardware Hacking guys have posted this brief tutorial with tips on improving the accuracy of ADC reading with the Arduino. They endeavor to do this by measuring the internal 1.1V reference voltage (it is available for ATMega 168 and ATMega 328 only) and, then, by normalizing the ADC.

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on Wednesday, June 13th, 2012 at 3:00 pm and is filed under Arduino, measurement, tutorials.
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